//
//  NewFeatureViewController.swift
//  SinaWeibo
//
//  Created by 张子国 on 15/11/13.
//  Copyright © 2015年 张子国. All rights reserved.
//

import UIKit
private let reuseIdentifier = "Cell"
private let imageCount = 4
class NewFeatureViewController: UICollectionViewController {
    
    init() {
        //实例化layout
        let layout = UICollectionViewFlowLayout()
        //1.指定layout 的itemSize  cell在实例化的时候 就会使用这个size
        layout.itemSize = UIScreen.mainScreen().bounds.size
        layout.minimumInteritemSpacing = 0
        layout.minimumLineSpacing = 0
        layout.scrollDirection = .Horizontal
        super.init(collectionViewLayout: layout)
        
        //设置分页滚动
        collectionView?.pagingEnabled = true
        collectionView?.showsHorizontalScrollIndicator = false
        collectionView?.bounces = false
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //手动注册cell
        self.collectionView?.registerClass(NewFeatureCell.self, forCellWithReuseIdentifier: reuseIdentifier)
    }
    
    //MARK: UICollectionViewDataSource
    override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return imageCount
    }
    
    override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell = collectionView .dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! NewFeatureCell
        //设置背景色
        cell.backgroundColor = indexPath.item % 2 == 0 ? UIColor.redColor() : UIColor.blueColor()
        cell.index = indexPath.item
        return cell
    }
    override func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
        let page = Int(scrollView.contentOffset.x / screenW)
        if page == imageCount - 1 {
            //开始动画效果
            if let cell = collectionView?.visibleCells().last as? NewFeatureCell {
                cell.startAnimation()
            }
        }
    }
    
}

class NewFeatureCell: UICollectionViewCell {
    
    var index: Int = 0 {
        didSet {
            iconImage.image = UIImage(named: "new_feature_\(index + 1)")
            startButton.hidden = true
        }
    }
    //MARK: 按钮的点击事件
    @objc private func start() {
        print("点我点我点我")
        NSNotificationCenter.defaultCenter().postNotificationName(AppSwitchRootViewControler, object: nil)

       
    }
    
    //开始动画的效果
    private func startAnimation() {
        
        startButton.transform = CGAffineTransformMakeScale(0, 0)
        UIView.animateWithDuration(1, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 5, options: [], animations: { () -> Void in
            self.startButton.hidden = false
            self.startButton.transform = CGAffineTransformMakeScale(1, 1)
            }) { (_) -> Void in
                print("OK")
        }
        
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        print(frame)
        setupUI()
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    //2.设置UI,布局
    
    private func setupUI() {
        //1.添加子视图
        contentView.addSubview(iconImage)
        contentView.addSubview(startButton)
        
        //2设置约束
        //edges 表示相对于 四周约束
        iconImage.snp_makeConstraints { (make) -> Void in
            make.edges.equalTo(contentView.snp_edges)
        }
        startButton.snp_makeConstraints { (make) -> Void in
                make.bottom.equalTo(contentView.snp_bottom).offset(-200)
                make.centerX.equalTo(contentView.snp_centerX)
        }
        //3设置点击开始体验按钮的点击事件
        startButton.addTarget(self, action: "start", forControlEvents:.TouchUpInside)
    }
    //1.实例化子视图控件
    private lazy var iconImage: UIImageView = UIImageView()
    //调用构造方法
    private lazy var startButton : UIButton = UIButton(title: "开始体验", backImage: "new_feature_finish_button", color: nil)
}

